Monolithic Power Systems Inc. MID04W0503AGY-3R-Z

Overview

MID04W0503AGY-3R-Z from Monolithic Power Systems is a regulated, isolated DC/DC converter delivering 3.3V at up to 120mA (0.4W) with 3kVDC input-to-output isolation, operating across 4.5–5.5V input and –40°C to +125°C ambient. It integrates power MOSFET, transformer, and feedback circuit in a single SOICW-16 package and supports isolated bias for RS-485, CAN, and digital isolators.

For engineers reviewing the MID04W0503AGY-3R-Z datasheet, MID04W0503AGY-3R-Z pinout, MID04W0503AGY-3R-Z application, or MID04W0503AGY-3R-Z equivalent, key selection criteria include certified 3kVDC isolation, ±0.3% load regulation, hiccup-mode short-circuit protection, CISPR32 Class B emissions compliance, and thermal shutdown at 160°C.

Technical Context

The device implements an integrated flyback topology with internal primary-side switching and secondary-side feedback via transformer coupling-no optocoupler or external compensation required. Regulation is achieved through primary-side sensing with adaptive duty-cycle control, enabling tight output accuracy (±0.3% at 25°C) without secondary-side components.

Its dual-ground architecture separates PGND1 (primary power ground), SGND1 (primary signal ground), SGND2 (secondary signal ground), and PGND2 (secondary power ground) to maintain isolation integrity and minimize EMI. The 7pF input-to-output capacitance and 50GΩ isolation resistance support robust noise immunity in high-noise industrial environments.

Key Specifications

Pinout & Package

Package: SOICW-16 (wide-body, 10.3mm × 7.5mm × 2.33mm), RoHS-compliant, MSL Level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated DC/DC converter applications.

Compared with RECOM R1SX-0503-R and ADuM6000, MID04W0503AGY-3R-Z delivers tighter regulation (0.3% vs ±10% or ±3%), built-in protection (SCP/OTP), and true single-chip integration-making it optimal for space-constrained, safety-certified industrial nodes where reliability trumps raw efficiency.

Availability

MID04W0503AGY-3R-Z is available at Aetrix Electronics and suitable for industrial automation systems, isolated sensor power supplies, and telecom network gateways requiring stable component supply with guaranteed 3kVDC isolation and -40°C to +125°C operation.

Supply support for MID04W0503AGY-3R-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with over two decades of expertise in integrated power solutions.

The MID series targets compact, certified isolated DC/DC conversion for industrial and communications infrastructure-designed to replace discrete flyback modules with minimal external components while meeting global safety standards.

FAQ

What is the maximum continuous output current supported by MID04W0503AGY-3R-Z?

The device delivers up to 120mA continuously at 3.3V (0.4W), verified across –40°C to +125°C ambient. Output current is limited by internal thermal design and derates linearly above 85°C ambient; full 120mA is guaranteed only below 85°C with proper PCB copper area and airflow.

Does MID04W0503AGY-3R-Z require external feedback components?

No. The device uses primary-side regulation with integrated feedback circuitry-no optocoupler, TL431, or external compensation network is needed. Output voltage is fixed at 3.3V and trimmed during production to ±0.3% accuracy at 25°C.

Can MID04W0503AGY-3R-Z operate with input voltages outside 4.5–5.5V?

No. The UVLO rising threshold is 2.61V (min), but reliable regulation and protection features are only guaranteed within 4.5–5.5V. Operation below 4.5V risks undervoltage lockout; above 5.5V exceeds absolute maximum rating and may damage the internal MOSFET.

How is EMI performance validated for this part?

EMI performance was measured per CISPR32 Class B using the EV04W0503A-3-Y-00A evaluation board (51mm×51mm, 2-layer, 1oz copper). Radiated emissions were confirmed ≤40dBμV/m at 3m distance from 30MHz–1GHz, with layout-dependent ferrite bead and Y-capacitor implementation as shown in Figure 2 of the datasheet.

What is the recommended PCB layout for minimizing output ripple?

Place 10μF and 0.1μF ceramic capacitors directly between VOUT (pins 13–14) and PGND2 (pins 15–16), with minimal trace length (<2mm). Use separate thin traces for SGND2 (pins 9–12) and avoid copper pours near secondary-side pins to prevent parasitic coupling that increases 50–100mVpp ripple.

Is MID04W0503AGY-3R-Z compliant with RoHS and halogen-free standards?

Yes. The device is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status via its Quality Assurance portal, and all packaging materials meet IPC/JEDEC J-STD-020 moisture sensitivity Level 3 requirements.

What safety certifications does MID04W0503AGY-3R-Z hold?

The part is UL1577 certified for 3kVDC isolation and CB certified to IEC62368-1 3rd Edition. Certification covers construction, dielectric strength, flammability (UL94 V-0), and creepage/clearance (≥8mm), enabling direct use in end-equipment safety approvals without retesting.